MTU Help – Site2Site VPN and poor file transfer

[tehcamel]

#155290

so, our client has a Virgin Media connection, terminates on a superhub.
Behind that, we have a Draytek, which has a site-2-site VPN configured.
The Superhub has “default” MTU configured. THe Draytek has mtu 1442 configured.

File transfers kill and die out – this includes if he tries to send emails with file attachments of ~2MB, or copy/paste them up onto the file server over the VPN.

I’m looking at two possibilities.
It’s the MTU – a mismatch between the SH and DT, or just set incorrectly.
OR, It’s Virgin hobbling the upload on what is a home connection.

So, what sort of MTU should I be looking at havving configured in this scenario ?

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